from odoo import _, fields, models
from odoo.exceptions import UserError, ValidationError, RedirectWarning
from odoo.tools.sql import column_exists, create_column
from odoo.tools import SQL

from odoo.addons.l10n_in.models.iap_account import IAP_SERVICE_NAME


class ResConfigSettings(models.TransientModel):
    _inherit = 'res.config.settings'

    group_l10n_in_reseller = fields.Boolean(
        implied_group='l10n_in.group_l10n_in_reseller',
        string="Manage Reseller(E-Commerce)"
    )
    l10n_in_edi_production_env = fields.Boolean(
        string="Indian Production Environment",
        related="company_id.l10n_in_edi_production_env",
        readonly=False
    )
    l10n_in_gsp = fields.Selection(selection=[
        ('bvm', 'BVM IT Consulting'),
        ('tera', 'Tera Software (Deprecated)'),
    ], string="GSP",
        inverse="_set_l10n_in_gsp",  # use an inverse method to invalidate existing tokens if the GSP is changed
        store=False,
        help="Select the GST Suvidha Provider (GSP) you want to use for GST services.",
    )
    l10n_in_hsn_code_digit = fields.Selection(
        related='company_id.l10n_in_hsn_code_digit',
        readonly=False
    )

    # TDS/TCS settings
    l10n_in_tds_feature = fields.Boolean(
        related='company_id.l10n_in_tds_feature',
        readonly=False
    )
    l10n_in_tcs_feature = fields.Boolean(
        related='company_id.l10n_in_tcs_feature',
        readonly=False
    )
    l10n_in_withholding_account_id = fields.Many2one(
        related='company_id.l10n_in_withholding_account_id',
        readonly=False
    )
    l10n_in_withholding_journal_id = fields.Many2one(
        related='company_id.l10n_in_withholding_journal_id',
        readonly=False
    )
    l10n_in_tan = fields.Char(
        related='company_id.l10n_in_tan',
        readonly=False
    )

    # GST settings
    l10n_in_is_gst_registered = fields.Boolean(
        related='company_id.l10n_in_is_gst_registered',
        readonly=False
    )
    l10n_in_gstin = fields.Char(
        string="GST Number",
        related='company_id.vat',
        readonly=False
    )
    l10n_in_gstin_status_feature = fields.Boolean(
        related='company_id.l10n_in_gstin_status_feature',
        readonly=False
    )
    l10n_in_gst_efiling_feature = fields.Boolean(string="GST E-Filing & Matching Feature")
    l10n_in_fetch_vendor_edi_feature = fields.Boolean(string="Fetch Vendor E-Invoiced Document")
    l10n_in_enet_vendor_batch_payment_feature = fields.Boolean(string="ENet Vendor Batch Payment")

    module_l10n_in_reports = fields.Boolean("GST E-Filing & Matching")
    module_l10n_in_edi = fields.Boolean("Indian Electronic Invoicing")
    module_l10n_in_ewaybill = fields.Boolean("Indian Electronic Waybill")

    def set_values(self):
        super().set_values()
        if self.country_code == 'IN':
            if (
                not self.module_l10n_in_reports
                and (
                    self.l10n_in_fetch_vendor_edi_feature
                    or self.l10n_in_gst_efiling_feature
                    or self.l10n_in_enet_vendor_batch_payment_feature
                )
            ):
                self.module_l10n_in_reports = True
            for l10n_in_feature in (
                "l10n_in_fetch_vendor_edi_feature",
                "l10n_in_gst_efiling_feature",
                "l10n_in_enet_vendor_batch_payment_feature",
            ):
                if self[l10n_in_feature]:
                    self._update_l10n_in_feature(l10n_in_feature)
            if self.module_l10n_in_edi:
                self._update_l10n_in_feature("l10n_in_edi_feature")
            if self.module_l10n_in_ewaybill:
                self._update_l10n_in_feature("l10n_in_ewaybill_feature")

    def _update_l10n_in_feature(self, column):
        """ This way, after installing the module, the field will already be set for the active company. """
        if not column_exists(self.env.cr, "res_company", column):
            create_column(self.env.cr, "res_company", column, "boolean")
            self.env.cr.execute(SQL(
                f"""
                    UPDATE res_company
                    SET {column} = true
                    WHERE id = {self.env.company.id}
                """
            ))

    def l10n_in_edi_buy_iap(self):
        if (
            not self.l10n_in_edi_production_env
            or not (
                self.module_l10n_in_edi
                or self.module_l10n_in_ewaybill
                or self.l10n_in_gstin_status_feature
                or self.l10n_in_gst_efiling_feature
            )
        ):
            raise ValidationError(_(
                "Please ensure that at least one Indian service and production environment is enabled,"
                " and save the configuration to proceed with purchasing credits."
            ))
        return {
            'type': 'ir.actions.act_url',
            'url': self.env["iap.account"].get_credits_url(service_name=IAP_SERVICE_NAME),
            'target': '_new'
        }

    def _l10n_in_check_gst_number(self):
        company = self.company_id
        if not company.partner_id.check_vat_in(company.vat):
            action = {
                'view_mode': 'form',
                'res_model': 'res.company',
                'type': 'ir.actions.act_window',
                'res_id': company.id,
                'views': [[self.env.ref('base.view_company_form').id, 'form']],
            }
            raise RedirectWarning(_("Please set a valid GST number on company."), action, _("Go to Company"))

    def reload_template(self):
        super().reload_template()
        if self.country_code == 'IN':
            branch_companies = self.company_id.child_ids
            if branch_companies:
                branch_companies._update_l10n_in_fiscal_position()

    def _l10n_in_is_first_time_setup(self):
        """
            Check if at least one company for India has been configured with the localization settings.
            If not, it means it's the first time setup.
        """
        all_validity_fields = ['l10n_in_gstr_gst_token_validity', 'l10n_in_edi_token_validity', 'l10n_in_ewaybill_auth_validity']
        validity_fields = (field_name for field_name in self.company_id._fields if field_name in all_validity_fields)
        if validity_fields:
            validity_fields_domain = fields.Domain.OR([[(field_name, '!=', False)] for field_name in validity_fields])
            configured_company_count = self.env['res.company'].sudo().search_count([
                ('account_fiscal_country_id.code', '=', 'IN'),
                *validity_fields_domain
            ])
            return not configured_company_count
        return True

    def get_values(self):
        res = super().get_values()
        res['l10n_in_gsp'] = self.env['ir.config_parameter'].sudo().get_param('l10n_in.gsp_provider')
        if not res['l10n_in_gsp']:
            if self._l10n_in_is_first_time_setup():
                # Default to BVM for new databases setting up India localization for the first time
                res['l10n_in_gsp'] = 'bvm'
            else:
                res['l10n_in_gsp'] = 'tera'
        return res

    def _l10n_in_gsp_provider_changed(self):
        """ Hook to be overridden in other modules to handle GSP provider change. """
        self.ensure_one()
        self.env['ir.config_parameter'].sudo().set_param('l10n_in.gsp_provider', self.l10n_in_gsp)

    def _set_l10n_in_gsp(self):
        gsp_before = self.env['ir.config_parameter'].sudo().get_param('l10n_in.gsp_provider')
        for config in self:
            if gsp_before != config.l10n_in_gsp:
                config._l10n_in_gsp_provider_changed()
            return